Lens



FIG. 1 is a front view of a lens, showing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a cross-sectional view thereof taken along the line 3-3 in FIG. 2;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view thereof. 

CLAIM The ornamental design for a lens, as shown and described. 